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"These volumes are the logs (navigational records) and journals (narrative accounts) of naval officers of ships engaged in exploration and surveying, which were used by the Hydrographic Office to produce charts and other data. Most of the logs were kept by naval captains, masters, lieutenants and masters' mates, although there are a few logs which were kept by boatswains or assistant surgeons. Amongst this collection of Royal Naval logs, there are a several logs which were kept by merchant ships. "